Flask



FIG. 1 is a perspective view of the top, front and left side of a flask showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The elements shown in phantom lines are not part of the present design. 

The ornamental design for a flask, as shown and described. 